subprocess - Python communicate with omxplayer -

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i want know when omxplayer starts playing live stream link. time takes 4-5 second times 6-7 second.

when execute os.system('omxplayer '+url), following message: 

no xset in (/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl) which: no xrefresh in (/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)

then when live stream starts (after 5-7 second), get:

video codec omx-h264 width 1280 height 720 profile 578 fps 25.000000 audio codec aac channels 2 samplerate 44100 bitspersample 16 subtitle count: 0, state: off, index: 1, delay: 0 v:portsettingschanged: 1280x720@25.00 interlace:0 deinterlace:0 anaglyph:0 par:1.00 layer:0 alpha:255

i trying second message via subprocess. never it. how can second message or how can know when omxplayer start working?

thanks

#!/usr/bin/python2  import sys, os, time subprocess import pipe, popen   url="http://livestreamlink.m3u8"   def main():     proc=popen(['omxplayer',url], stdout=pipe)     time.sleep(5)     print proc.communicate()[0]   if __name__ == "__main__":     main()

try this:

proc=popen(['omxplayer',url], stdout=pipe, stderr=pipe) print proc.communicate()   # remove [0]

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